Is it possible to handle the child recycler view data dynamically without refreshing parent item list?

I want to update my child view data after selecting a parent item. I don’t want that same child list to be applied to all the parent items. I have tried many solutions. I would really appreciate someone if you can help me get out of this recycler view linking problem.

Here’s the link to my github code for the files I am using to achieve this goal.

Note: It does not contain entire code as I am working on my work project.

Github: